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+_**This is a work in progress.**_
+
+# Description
+User cannot visually design a layout of dashboard widgets.  This layout tool will allow a user to deploy dashboard widgets by drag & drop.
+
+There are several requirements that this layout tool should satisfy.
+1. Change the order of widgets in a group by drag & drop.
+2. Change the size of a widget.
+3. Pad [`spacedout` widgets](https://github.com/node-red/node-red-dashboard/tree/spacedout) when blank spaces are needed.
+4. Move a widget from one group to the another.
+5. (optional) Change the size of a group.
+
+# User interface
+To show the layout tool of dashboard, Add `layout` button on the tab menu.
+
+![dashboard sidebar](https://raw.githubusercontent.com/wiki/node-red-hitachi/node-red/images/layout_tool/dashboard_sidebar.png)
+
+When a user clicks the `layout` button, the window of a layout tool will appear.  It should look like the maximized window of function node.
+After a user adjusts the layout on the window:
+- If the user clicks `Done` button:
+  - inserts spacedout widget if necessary.
+  - updates the layout of sidebar and workspace.
+- If the user clicks `Cancel` button, the change will be discarded.
+
+
+![Layout tool](https://raw.githubusercontent.com/wiki/node-red-hitachi/node-red/images/layout_tool/Layout_tool_overview.png)
+
+
+# Future discussion
+- Add a node on the layout tool.
+- Add/remove a group.